So, on the widgets page, I removed that RSS widget, and put another one in the sidebar (because there are a few RSS widget on the widget page, so I just picked a different one - btw, there are 2 kinds of RSS widgets; 1 says just "RSS" and the other says "RSS Links" - the one I'm using says just "RSS."

Tried this new one out, but still getting the same incorrect feed URL:

Then you will have to contact Staff. Here’s the link http://en.support.wordpress.com/contact/ After you use the searchbox, under the search results, at the bottom of the page there will be a section that says “Have you found the answer to your question?” You can choose either “Yes I found the answer to my question.” or “No I didn’t find the answer to my question and I would like to contact support for help.” The no option will reveal the contact form.

When you put http://sylverblaque.wordpress.com/feed/ into a browser address bar it will resolve to feed://sylverblaque.wordpress.com/feed/ , but you cannot start from the feed:// address. You have to start from the http:// address.